Something odd appeared to be going on at Lady Gaga's apartment Sunday.
In a series of posts, a Twitter user claimed that gossip blogger Perez Hilton was scoping out Gaga's building in New York.
Gaga hopped on the social media site a bit later to ask if what her fan said was true, before launching into a Twitter tirade against Hilton -- and anyone else that harasses her. (Though she apparently wasn't at her apartment at the time, she noted that building management confirmed Hilton was on the premises.)
It wasn't too long ago that Gaga and Hilton were best buds. The pair apparently had a falling out after Hilton allegedly sent the "Applause" singer a photo of her in a wheelchair with a snarky message after her hip accident. Gaga later took to Twitter to vent her frustrations and publicly slammed her former friend.
Hilton has yet to respond to Gaga's gripes on Twitter.